China Air Pollution Problem

BEIJING, CHINA - JANUARY 31: A little tourist and his parents play on the ground with frozen ice at the Tiananmen Square during severe pollution on January 31, 2013 in Beijing, China. Heavy smog that has choked Beijing for the last five days weakened slightly on Thursday due to a light rainfall, although the capital's air remains heavily polluted. The haze choking many Chinese cities covers a total area of 1.43 million square kilometers, the China's Ministry of Environmental Protection said Wednesday. (Photo by Feng Li/Getty Images)

Beijing Air Pollution Is Still At The Dangerous Level

(Photo by Feng Li/Getty Images)

BEIJING, CHINA - JANUARY 31: Tourists wearing the masks walk on the Tiananmen Square during severe pollution on January 31, 2013 in Beijing, China. Heavy smog that has choked Beijing for the last five days weakened slightly on Thursday due to a light rainfall, although the capital's air remains heavily polluted. The haze choking many Chinese cities covers a total area of 1.43 million square kilometers, the China's Ministry of Environmental Protection said Wednesday. (Photo by Feng Li/Getty Images)

Beijing Air Pollution Is Still At The Dangerous Level

BEIJING, CHINA - JANUARY 31: Tourists visit the Tiananmen Square during severe pollution on January 31, 2013 in Beijing, China. Heavy smog that has choked Beijing for the last five days weakened slightly on Thursday due to a light rainfall, although the capital's air remains heavily polluted. The haze choking many Chinese cities covers a total area of 1.43 million square kilometers, the China's Ministry of Environmental Protection said Wednesday. (Photo by Feng Li/Getty Images)

Beijing Air Pollution Is Still At The Dangerous Level

BEIJING, CHINA - JANUARY 31: Tourists visit the Tiananmen Square during severe pollution on January 31, 2013 in Beijing, China. Heavy smog that has choked Beijing for the last five days weakened slightly on Thursday due to a light rainfall, although the capital's air remains heavily polluted. The haze choking many Chinese cities covers a total area of 1.43 million square kilometers, the China's Ministry of Environmental Protection said Wednesday. (Photo by Feng Li/Getty Images)

CHINA-ENVIRONMENT-POLLUTION

Chinese commuters wear face masks as they cross a central business district road during heavy air pollution in Beijing on January 30, 2013. Beijing urged residents to stay indoors as emergency measures were rolled out aimed at countering a heavy cloud of smog blanketing the Chinese capital and swathes of the country. The municipal government said children, the elderly and people sensitive to poor air quality should remain indoors, after authorities announced the closure of 103 factories and ordered 30 percent of official cars off the road. AFP PHOTO/Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)

Severe Air Pollution Continuous In Beijing

BEIJING, CHINA - JANUARY 30: A general view of Beijing city during severe pollution on January 30, 2013 in Beijing, China. The fourth round of heavy smog to hit Beijing in one month has sent more people to the hospital with respiratory illnesses and prompted calls for legislation to curb pollution. The haze choking many Chinese cities covers a total area of 1.3 million square kilometers, the China's Ministry of Environmental Protection said Tuesday. (Photo by Feng Li/Getty Images)

Severe Air Pollution Continuous In Beijing

BEIJING, CHINA - JANUARY 30: A general view of Beijing city during severe pollution on January 30, 2013 in Beijing, China. The fourth round of heavy smog to hit Beijing in one month has sent more people to the hospital with respiratory illnesses and prompted calls for legislation to curb pollution. The haze choking many Chinese cities covers a total area of 1.3 million square kilometers, the China's Ministry of Environmental Protection said Tuesday. (Photo by Feng Li/Getty Images)

Severe Air Pollution Continuous In Beijing

BEIJING, CHINA - JANUARY 30: A general view of Beijing city during severe pollution on January 30, 2013 in Beijing, China. The fourth round of heavy smog to hit Beijing in one month has sent more people to the hospital with respiratory illnesses and prompted calls for legislation to curb pollution. The haze choking many Chinese cities covers a total area of 1.3 million square kilometers, the China's Ministry of Environmental Protection said Tuesday. (Photo by Feng Li/Getty Images)

Severe Air Pollution Continuous In Beijing

BEIJING, CHINA - JANUARY 30: A general view of Beijing city during severe pollution on January 30, 2013 in Beijing, China. The fourth round of heavy smog to hit Beijing in one month has sent more people to the hospital with respiratory illnesses and prompted calls for legislation to curb pollution. The haze choking many Chinese cities covers a total area of 1.3 million square kilometers, the China's Ministry of Environmental Protection said Tuesday. (Photo by Feng Li/Getty Images)

Severe Air Pollution Continuous In Beijing

BEIJING, CHINA - JANUARY 30: A general view of the Central TV Tower during severe pollution on January 30, 2013 in Beijing, China. The fourth round of heavy smog to hit Beijing in one month has sent more people to the hospital with respiratory illnesses and prompted calls for legislation to curb pollution. The haze choking many Chinese cities covers a total area of 1.3 million square kilometers, the China's Ministry of Environmental Protection said Tuesday. (Photo by Feng Li/Getty Images)

CHINA-ENVIRONMENT-POLLUTION

Japanese tourists take photos from the historic Jingshan Park as smog continues to shroud Beijing on January 31, 2013. Doctors in Beijing said on January 31 that hospital admissions for respiratory complaints rose in recent days during the latest bout of air pollution to cover northern China. AFP PHOTO/Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)

CHINA-ENVIRONMENT-POLLUTION

Chinese tourists look at the view from the historic Jingshan Park as smog continues to shroud Beijing on January 31, 2013. Doctors in Beijing said on January 31 that hospital admissions for respiratory complaints rose in recent days during the latest bout of air pollution to cover northern China. AFP PHOTO/Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)

CHINA-ENVIRONMENT-POLLUTION

A general view shows the Guotai Chambers building from the historic Jingshan Park as smog continues to shroud Beijing on January 31, 2013. Doctors in Beijing said on January 31 that hospital admissions for respiratory complaints rose in recent days during the latest bout of air pollution to cover northern China. AFP PHOTO/Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)

CHINA-ENVIRONMENT-POLLUTION

A Chinese tourist takes photos of the Forbidden City from the historic Jingshan Park as smog continues to shroud Beijing on January 31, 2013. Doctors in Beijing said on January 31 that hospital admissions for respiratory complaints rose in recent days during the latest bout of air pollution to cover northern China. AFP PHOTO/Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)

Beijing Air Pollution Is Still At The Dangerous Level

BEIJING, CHINA - JANUARY 31: Tourists wearing the masks walk on the Tiananmen Square during severe pollution on January 31, 2013 in Beijing, China. Heavy smog that has choked Beijing for the last five days weakened slightly on Thursday due to a light rainfall, although the capital's air remains heavily polluted. The haze choking many Chinese cities covers a total area of 1.43 million square kilometers, the China's Ministry of Environmental Protection said Wednesday. (Photo by Feng Li/Getty Images)

Beijing Air Pollution Is Still At The Dangerous Level

BEIJING, CHINA - JANUARY 31: A little tourist wearing the PM2.5 mask walk on the Tiananmen Square during severe pollution on January 31, 2013 in Beijing, China. Heavy smog that has choked Beijing for the last five days weakened slightly on Thursday due to a light rainfall, although the capital's air remains heavily polluted. The haze choking many Chinese cities covers a total area of 1.43 million square kilometers, the China's Ministry of Environmental Protection said Wednesday. (Photo by Feng Li/Getty Images)

CHINA-ENVIRONMENT-THEME-POLLUTION

This picture taken on January 29, 2013 shows a general view of buildings in the heavy smog in Jilin, northeast China's Jilin province. Beijing urged residents to stay indoors on January 30 as emergency measures were rolled out aimed at countering a heavy cloud of smog blanketing the Chinese capital and swathes of the country. CHINA OUT AFP PHOTO (Photo credit should read STR/AFP/Getty Images)